10 species of primates. Faces of 10 primate species. Species shown in pictures are: (1) Tonkin Snub-nosed Monkey, Rhinopithecus avunculus, (2) Proboscis Monkey, Nasalis larvatus, (3) Javan Langur, Trachypithecus auratus, (4) Ugandan Red Colobus, Piliocolobus tephrosceles, (5) Mandrill, Mandrillus sphinx, (6) Stump-tailed Macaque, Macaca arctoides, (7) Moustached Guenon, Cercopithecus cephus, (8) Angolan Talapoin Monkey, Miopithecus talapoin, (9) Common Chimpanzee, Pan troglodytes and (10) Northern White-cheeked Gibbon, Nomascus leucogenys. Warmer colors indicate more highly complex faces — that is faces in which the pattern is composed by many colors. Image credit: Illustrations copyright 2012 Stephen D. Nash/IUCN/SSC Primate Specialist Group (Click image to enlarge)